Children always want to urinate before bedtime may be caused by physiological factors, polyuria frequency, inflammatory frequency, neurogenic frequency, reduced bladder capacity frequency, periurethral lesions and other reasons. 1. Physiological factors: for example, more drinks or water before going to bed, mental stress, cold environment, can lead to increased urination, mostly normal phenomenon. Reduce the intake of liquid, improve the environment, adjust the mood, usually can improve the situation of frequent urination. 2. Pathologic factors: (1) polyuria frequency: increased urination, and each time the volume of urine is not less, and the total volume of urine increased. See diabetes mellitus, uremia, etc. (2) Inflammatory dysuria: frequent urination and small amount of urine each time, mostly accompanied by urinary urgency and urinary pain, such as cystitis, urethritis and so on. (3) Neurogenic urinary frequency: frequent urination and small amount of urine each time, mostly seen in central and peripheral neuropathy, such as hysteria, neurogenic bladder. (4) Reduced bladder capacity urinary frequency: such as bladder occupation, bladder tuberculosis, etc., manifested as persistent urinary frequency. (5) Periurethral lesions: urethral polyps, paraurethral cysts, etc. irritate the urethral opening causing urinary frequency. Children always want to urinate before bedtime, it is recommended to consult a regular hospital in time.